离子液体[MMIM]DMP-甲醇浓溶液气液平衡

1-methyl-3-methylimidazolium dimethyl phosphate（[MMIM]DMP）is one low-cost ionic liquid with a good prospect of application, the vapor-liquid equilibrium data and prediction model of binary system or ternary systems composed of [MMIM]DMP and methanol, water or other common solvents are urgently needed in the practical applications, especially in separation process. This paper measured the saturated vapor pressure of solution composed of [MMIM]DMP and methanol with the temperature ranging from 30℃ to 90℃ and the molarity of [MMIM]DMP ranging from 0.40 to 0.45, furthermore the vapor pressure data were correlated by NRTL model for nonelectrolyte solution with the average relative deviation of 0.0159 and less than 2%; vapor-liquid equilibrium data and calculation model of weak solutions reported in the existing literatures were analyzed, it is found that the impact of the law to low IL content in [MMIM]DMP/methanol solutions is similar to middle or high IL content, but not agree well with each other. Moreover, they all can be well corrected and forecasted by NRTL model, but no universal parameters. The relationship of saturated vapor pressure and temperature in a certain concentration [MMIM]DMP/methanol solution is similar to pure solvent, in line with the Antoine equation. From the view of vapor-liquid equilibrium, [MMIM]DMP/methanol as working pair to be used in the absorption refrigeration system is possible.